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  • 1.
    Asplund, Disa
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK.
    Discounting transport infrastructure investments2018Report (Other academic)
    Abstract [en]

    The main aim of the study is to advice the Swedish national guidelines on cost-benefit analysis (CBA) of transport infrastructure investments, ASEK about the appropriate set of discount-rates (currently 3.5% for all investments). To this end, first a literature review with a theoretical focus along with some new perspectives are provided. Second the conclusions are applied to Swedish infrastructure transport CBA, using the current proposition of a new HSR line as a case. Based on empirical research concerning parameter values new discount rates are estimated, and sensitivity analysis performed. The best estimate of the social discount rate in the present study, for land transport infrastructure investment in Sweden, is about 5.1%.

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    FULLTEXT01
  • 2.
    Asplund, Disa
    et al.
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK.
    Pyddoke, Roger
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK.
    Optimal pricing of car use in a small city: a case study of Uppsala2019Report (Other academic)
    Abstract [en]

    Studies of cities which successfully have shifted mode choice from car to more sustainable modes, suggest that coordinated packages of mutually reinforcing policy instruments are needed. Congestion charges and parking fees can be important parts of such packages. This paper aims to examine the introduction of welfare optimal congestion charges and parking fees in a model calibrated to Uppsala, a small city in Sweden. The results suggest that welfare optimal congestion charges in Uppsala are as high as EUR 3.0 in the peak hours and EUR 1.5 in the off-peak. In a rough cost-benefit analysis it is shown that the introduction of congestion charges in Uppsala are welfare improving if operating costs of congestion charges are proportional to city population size (compared to Gothenburg). The model can be used to assess when it is worthwhile to introduce congestion pricing.

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  • 3.
    Asplund, Disa
    et al.
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK.
    Westin, Jonas
    CERUM, Umeå universitet.
    Modellering av slingor inom sjötransporter2017Report (Other academic)
    Abstract [en]

    The Swedish national freight transport model system Samgods is a freight model that simulates logistics decision at a disaggregated firm-to-firm level. The model calculates total annual transport demand in Sweden for all transport modes based on a deterministic cost minimization approach. The model cannot consolidate commodities of different commodity types in the same vessel, train or truck and can only simulate vessels using direct routes between two ports. This implies that many of the features of sea transport such as utilizing larger vessels and building loops to consolidate goods from different ports is not possible in the current Samgods version. In this paper, we analyze the effect of removing restrictions in sea transportation especially by allowing the ship operators to construct and utilize loops. In the new model, LIFREM (Loops Including FREight Model), the shippers’ choice of sea transport routes is modelled as a mixed integer linear programming optimization problem. In doing so, we make use of a case study on sea transport of forest products from Northern Sweden to Western Europe. The results show that allowing predefined loops decreases total logistic cost by 10% and allowing the shipper to freely select loops decreases the cost by 21%. These results show that modelling of loops is important in order to realistically represent the attractiveness of the sea transport mode. This is also confirmed by the fact that the sea mode share increases by 2–4% in LIFREM when loops are allowed.

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  • 4.
    Westin, Jonas
    et al.
    Umeå universitet, Centrum för regionalvetenskap (CERUM).
    Asplund, Disa
    Statens väg- och transportforskningsinstitut (VTI).
    Sjöfartens konkurrenskraft - Betydelsen av returtransporter2021Report (Other academic)
    Abstract [sv]

    Samgods är den nationella godsmodellen som på myndighets- och departementsnivå används för transportprognoser, kvantifieringar av effekter av åtgärder, policyanalyser och stråkanalyser för godstrafik. Modellering av sjöfart i Samgods sker idag på ett förenklat sätt genom fixa avgångs¬frekvenser mellan hamnar, utan möjlighet för modellen att lösa transportproblemet genom användning av distributionsslingor eller returtransporter. Syftet med detta projekt är att undersöka potentiella effekter av att införa slingor och returtransporter i en modell med en liknande struktur som Samgods. Projektet ska även ge förslag på hur slingor och returtransporter kan inkorporeras i kommande versioner av Samgods. Den modell som används i projektet är en vidare¬utveckling av LIFreM-modellen som utvecklades i det tidigare projektet ”Sjötransporter i modell och verklighet – betydelsen av samlastning, skal¬fördelar, frekvens, hastighet, lastbärare och slingor” som genomförts under 2016 - 2017.

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1 - 4 of 4
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